已知[tex=2.143x1.286]5u+Kfi2y78D0EeH+RhjPUA==[/tex]时正弦量的值为[tex=5.357x1.286]c6b5TwDROtJAN+303Dtl+A==[/tex]。相量图如图所示, 试写出正弦量的瞬时值表达式及相量式。[img=280x243]17d2e1d73c15bb8.png[/img]
[tex=0.571x1.286]PTQwXI08cZXml6Nm1F/Zlw==[/tex]的初相位是[tex=1.429x1.286]8T7kuIaFr5xpvtDuPXZAIg==[/tex], 即[tex=12.5x1.286]tkZI9VkchbZYMEJihd0dBUfp1trdi2o3jcoJ/yFuS8Qu8uOeO2jrMmtKKh4++dVQ[/tex], 所以[tex=10.143x1.286]ziprBLVdV2yBulUQyoVPxGQgTLoJLpjh+/3Va/xFxfssSQqRzCul+7QcNKevgMhAgC2pguv7EPQUiNayhqEfWQ==[/tex]相量式[tex=20.143x2.214]WN+5K6Jpc1KfYs+7x9t9RYruiy8fQ7kj9E2siPahg/tBbQPK+zFMLX2RjeLY2YHQmueNmr6Y1joqpGhK9SggDfLyI1i23HQXA/teFaCecOP4S+EkIDYCmSSrSIofvl0GVfoM6UAhpzRLitRYRDteWIGAGoMXK3ywAn8P3MoljKI=[/tex]
举一反三
- 已知 [tex=9.786x1.571]yw+ozz7qALVBsBufXNJ627y5bwA+2vUjg0hck9X6BjruNFpD1qqi87FhVyXhu2dYEEy882iYQNESmATnG6Z2rQ==[/tex][tex=10.286x1.571]usUvMrfswiUAbYcbubVaedoQW6Zcj4OgQ5Z8AfDCvRQorN9IOO76py17r+1mbHNn/7ddWTAPnBdcpCi5mPISsw==[/tex](1) 求各正弦琩对应的相量, 并画出相量图;(2) 借助相量图, 求 [tex=2.5x1.214]rS9j4CErsxx3QhkYohVmPQ==[/tex](3) 求各正弦量的相量式 (复数式);(4) 借助复数求 [tex=2.214x1.214]SbNJGHPHmwKVdP7t6VPgHg==[/tex] 。注:正弦量与相量之间是一一对应的关系,只能用(→)表示,而不能用等号。
- 写出下列正弦电压的相量式,画出相量图,并求其和:[tex=10.929x2.786]s2RNrSZe2D8ifzjv/+ANjer5RnevM5nkna5gpxopbdpO04KNltFGhuhD3LOqs1eAztN8DXo7gv3BlOQhRbqv1blNJQuLCZ62i1+SItMJBIE=[/tex]
- 写出下列正弦电压的相量式,画出相量图,并求其和:[tex=10.214x2.214]s2RNrSZe2D8ifzjv/+ANjer5RnevM5nkna5gpxopbdpRpLvI4r4HqZxprLBo6Y+ao4dEmfSijJ+Pj3k173tvT8OsjGB3TBai54RTdMP2Y4I=[/tex]
- 写出下列正弦电压的相量式,画出相量图,并求其和:[tex=7.357x1.5]s2RNrSZe2D8ifzjv/+ANjXjWgvUl+gmD/SRzEHCp66zIE2DFesJV3KNoio9DRMgc[/tex]
- 写出下列正弦电压的相量式,画出相量图,并求其和:[tex=10.214x2.214]s2RNrSZe2D8ifzjv/+ANjer5RnevM5nkna5gpxopbdrUFeWJz8g5ESWOhqkEdS2HmRVbLUuFJfN5bLjGuz0lqryT9KvDNxttGdwEGviZBtg=[/tex][br][/br]
内容
- 0
将下列各正弦量表示成有效值相量,并绘出相量图。[tex=10.071x1.357]tXDGxsybca6UZgg5EIOu5LTYgEJ4YpVMCRmkoKrMt2uy69c1+xMigYK5EgWBJkiwxdoojf5XeI37IgSI80BXSw==[/tex] [tex=10.143x2.214]7e5vJtruZCfOg+J/Vy1Jguwfc6gaTLj/zFZvLUhCGrqfckzegYXxvMLtR9uoatzuDWZ/0zQSXiqbI3MJVI7Xlw==[/tex]
- 1
求正弦电流的相量(即有效值相量)[tex=6.071x1.357]fgYW7yLWDUUPVtpX7UmuFYDrA5n3XfjUTVuSEzCCBH0=[/tex]
- 2
试求下列有效值相量对应的正弦量。 [tex=0.929x1.214]yONYFMbusn0xJMtIw8xXwA==[/tex][br][/br]
- 3
在图题 6.8[tex=1.286x1.357]er4O2EbOoIljcFUJYHO1qw==[/tex] 所示电路中各元件电压、电流取关联参考方向。设[tex=4.143x1.357]rTPauJG4rDOHIqjjdFMo+6ByQotuXYUUWjntlV6g4l0=[/tex],画出各电流、电压相量图,根据相量图写出各元件电压、电流相量。[img=700x451]17992e7c3454a7d.png[/img]
- 4
求各正弦电流的相量(即有效值相量)。[tex=6.071x1.357]XFn2/Nnf3kYtPYxgAmNfXXGg6xdA7pojyQvorjSbbVc=[/tex]